Sound reproducer



July 17, 1928. I 1,677,605

G. STROBINO SOUND REPRODUGER Filed Feb. 17, 1926 IIVVENTOR QqsTon S'Hoain 0,

3% g. r ATTORNEY Patented July 17, 1928.

UNITED ST GASTON STBOBINO, OF IPATERSON, NEW JERSEY.

SOUND BEPRODUCEB.

Application filed February The object of this invention is to provide a resonator to be put in a state of resonance,

and to be used like the sorcalled loudspeaker in connection with radio apparatus, 6 by vibrations imparted thereto as the result of electrical impulses imparted to an electro-magnetic actuator. In the device illustrated herein by way of example the resonating body includes two concave-con- 10 vex parts, as of wood, bearrn against each other at their peripheries, w1t outlet means for the escape of sound emanatlng within the body thus formed.

'In the drawing,

Fig. 1 is a plan of the device;

Fig.- 2 is a side elevation, partly in section; and

Fig. 3 is a central vertical section of a fragment of the device, on a larger scale.

In said drawing, 11 designates the upper and lower concave-convex parts, as of wood, bearin against each other at their peripheries, geing there held together by the screw-bolts 2. The upper one has a 25 sound outlet 3 and the lower one preferably has supporting legs 4.

5 is a member, in the present case formed horse-shoe shaped with its ends bent off in opposite directions and threaded and formed or provided with shoulders 5" a must WhlCh bear the washers 5 this is metal and preferably a permanent magnet. It is housed within the resonator, which thus forms a casin and has its threaded ends passed throng central holes in the parts l'1'and fitted with nuts 6-6, which when screwed up tight establish all the parts 11, -and 6-6 in fast relation to each other. The position of member 5, it will be noted, is such that vibration of either arm thereof will be in the same direction as vibration of the resonator-forming parts or walls 1-1, or vertically in the present example.

On soft-iron prolongations 77 of the arms of said member, whichare bent toward each other and have their free ends opposed, are the coils 8-8 electrically connected together as at 8 and arran ed in a suitable exciting circuit so that in citation of the electro-magnets formed by the coils and their cores 77 magnetic attraction will overcome the resistance of said member (which is elastic.) to undergo change in its form and intermittently tenthey of course receding as soon as the attlie periods of exsion it, drawing the arms toward each other,

17, 1926. 'Serial no. 88,835.

traction ceases. The coils are assumed to be in a circuit over which a current made undulatory'by the action of sound waves is transmitted; this circuit is shown 'as comprising the conductors 10, the clips 10 to which they are connected and the leads 10 connecting the clips with the electro-magnets.

The prolongations 7-7 (which form the cores'of the electro-magnets and each of which in the present case is the armature of the opposite magnet) are arranged as close as possible together without touching in the vibratin of the member 5, and means is provided whereby the member may be put'in a desirable state of tension and the cores brought together to the proper spacing. To this end, 11- isa plate-spring, preferably of metal, which has one end bearing outwardly against the washer 5 on one arm of member 5 and its other end bent off to form a foot 11 to rest on the relatively opposite part or wall l'of the resonator, and 12 is a screw penetrating the said resonator part and this spring and having its head bearing on the spring and a thumb-nut 13 to bear against said part.

In mydevice the actuator afforded by either electro-magnet has a fixed connection with a resonator, as for example the lower electro-magnetS with the lower resonating part 1, and vibrations set up in the actuator y variatlons' in the electric current producevibrations of the resonator, the construction being preferably such as shown that such resonator has a projection afforded by the relatively remote arm of member 5, vibratory lndependently of the resonator, and the actuator and its armature are arranged so that one is on said projection and the other on some portion of the structure including the resonator and projection with respect to which the projection is iudependently vibratory, so that sound is the result not merely of molecular disturbance in the actuator but of the magnetic force being utlllzed to intermittently tension this vibratory structure. In this and other respects the present device embodies the principles of theinvention set forth in my application Serial N 0. 74,276. 1

But in the present case I have not merely interposed an elastic element as 5 between two resonators so that it becomes asto each such resonator an independently vibratoryprojection therefrom: I have given these resonators l-la support on each other and formed them so. that one at least presents a concave side or hollow tothe other. i I have further provided means, 1112-13, whereby the structure formed by the two resonators is tensioned, and whereby also the member 5 is also tensioned and the distance between the poles of the electro-magnets calibrated.

Having thus fully described my invention what I claim and desire to secure by Letters Patent is:

1. A resonating structure including, with two opposite portions supported one on the other, one being resonant and one having a hollow presented to the other, and an elastic vibratory element forming a projection from the resonant portion vibratory independentl thereof, means holding said portions an elements in a state of tension, and means to vibrate said element and thereby the resonant portion.

2. A resonating structure including, with two opposite portions supported one on the other, one being resonant and one having a hollow presented to the other, and an elastic vibratory element forming a projection from the resonant portion vibratory independently thereof, elastic mean-s holding said portions and element in a state of tension, and means to vibrate said element and thereby the resonant portion.

3. A resonating structure including, with two opposite portions supported one on the other, one being resonant and one having a hollow presented to the other, and an elastic vibratory element forming a projection from the resonant portion vibratory independently thereof, adjustable means to tension said portions and element, and means to vibrate said element and thereby the resonant portion.

4. A resonating structure.including, with two opposite portions supported one on the other, one being resonant and one having a hollow presented to the other, and an elastic vibratory element forming a projection from the resonant portion vibratory independently thereof, adjustable means to tension said portions and element, and means to vibrate said element and thereby the resonant portion, the former means being elastic.

5. A resonating structure including, with two opposite portions supported one on the other, one being resonant and one having a hollow presented to the other, and a bent elastic vibratory element forming a projection from the resonant portion vibratory independently thereof, means holding said portions and element in a state of tension, and an electro-magnetic actuator and its armature arranged on said element on opposite sides of its bend and held by the latter in operative relation to each other as said element is thus tensioned.

6. The combination of a resonating structure including a resonant hollow casing and a vibratory element contained in the space of said casing and forming a projection therefrom vibratory independently thereof, means to vibrate said element and thereby the casing and means holding the casing tensioned.

7. The combination of a resonating structure including a resonant hollow casing and a vibratory element contained inthe' space of said casing and forming a projection therefrom vibratory independently thereof, means to vibrate said element and thereby the casing, and elastic means holding the casing tensioned.

8. The combination of a resonating structure including a resonant hollow casing and a vibratory element contained in the space of said casing and forming a projection therefrom vibratory independently thereof, means to vibrate said element and thereby the casing, and adjustable means to tension said casing.

9. The combination of a resonating struc ture including a resonant hollow casing and a vibratory element contained in the space of said casing and forming a pro'ection therefrom vibratory independently t ereof, means to vibrate said element and thereby the casing, and adjustable means to tension said casing, the latter means being elastic.

10. The combination of a resonating structure includin a resonant hollow casing and an elastic vi ratory element contained in the space of said casing and forming a,

projection therefrom vibratory independently thereof, means to vibrate said element and thereby the.casing, and means holding said casing and element tensioned.

11. The combination of a resonating struc: ture includin a resonant hollow casing and an elastic vi ratory element contained in the space of said casing and forming a projection therefrom vibratory independently thereof, means to vibrate said element and thereby the casing, and elastic means holding said casing and element tensioned.

12. The combination of a resonating structure includin a resonant hollow casing and an elastic vi ratory element contained in the space of said casing and forming a projection therefrom vibratory independently thereof, means to vibrate said element and thereby the casing, and adjustable means to tension the casing and said element.

13. The combination of a resonatingstructure including a resonant hollow casing and an elastic vibratory element contained in the space of said casing and forming a projection therefrom vibratory independently thereof, means to vibrate said element and thereby the casing, and adjustable means to tension the casing and said element, the latter means being elastic.

14. The combination of a resonating structure including a resonant hollow casing and a bent elastic vibratory element contained in the s ace of said casing and having its extremlties rigidly connected to spaced points of the casing, means holding the casing and said element in a state of tension and an electro-magnetic actuator and its armature arranged on said element on opposite sides of its bend and held by the latter in opera-. ,0

GASTON STROBINO. 

